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Nanocomposite polymer electrolytes (NCPEs) have been playing a considerable role in the development of alternative clean and sustainable energy technologies. This review article summarizes the recent research progress on the synthesis and characterization of NCPEs and its application in lithium ion battery based energy storage devices. First, an introduction on the properties, synthesis strategies and use of NCPEs is briefly given, followed by a state-of-the-art review on the preparation of NCPEs and their electrochemical properties in lithium ion battery (LIB) applications. Finally, the prospects and future challenges of NCPEs for energy storage are discussed

Abstract: We have discovered a high oxide ion conductor within the perovskite-type (Ba1-x-ySrxLay)InO2.5+y/2 solid-solution system. The system was derived from brownmillerite-type Ba2In2O5, which possessed a ordered oxide ion vacancies. When we doped La3+ into the Ba site, the vacancy changed to a disordered state. The oxide ion conductivity increased with the amount of doped La3+, reaching a maximum value of 0.12 (S/cm) at 800 oC in (Ba0.3Sr0.2La0.5)InO2.75, a level exceeding that of yttria-stabilized zirconia. The oxide ion conductivity of this system was strongly dependent on the unit cell free volume, which appears to be the key parameter governing oxide ion mobility.

Abstract: Hexanoyl chitosan that exhibited solubility in THF was prepared by acyl modification of
chitosan. Films of hexanoyl chitosan-based polymer electrolyte were prepared by the technique of
solution casting. The effect of plasticizers on the electrical properties of hexanoyl chitosan:
LiCF3SO3 electrolytes have been investigated. The plasticizers used were EC, PC and a mixture of
EC and PC. The highest room temperature conductivity of about 1.1 x 10-4 S cm-1 was achieved for
electrolyte with composition of 50:50 (wt.%) mixture of PC: EC. The variations in conductivity
have been explained using the Rice and Roth model from which the numbers of free ions per unit
volume, mobility and diffusion coefficient of free ions were obtained. Electrochemical cells based
on LiCoO2/MCMB couple were assembled using the electrolyte that exhibited the highest ionic
conductivity. The performance of the cells have been studied and discussed in this paper.

Abstract: Dielectric properties of proton conducting polymer electrolyte system, containing polyethylene oxide (PEO) as host polymer and ammonium hexfluorophosphate (NH4PF6) as complexing salt plasticized with EC and EC:PC, are investigated. The free standing films of thickness ~ 200 - 300µm are synthesized by solution casting technique. The electrical conductivity studies show that plasticization of the polymer electrolyte results into an enhancement in its conductivity by about two orders of magnitude. The maximum room temperature bulk conductivity is obtained to be ~ 10-5 S/cm for the plasticized polymer electrolyte. To understand the ion transport mechanism, different frequency dependent parameters are measured like dielectric permittivity, loss tangent and AC conductivity. The ionic transference number of the prepared systems is found to be close to unity which shows ion dominant charge transport in the electrolyte system. The conductivity of the polymer electrolyte has been found to be very sensitive to the relative humidity, which makes it a good candidate for its application for humidity sensor.

Abstract: Solid polymer electrolytes (SPEs) which were composed of poly (ethylene oxide) (PEO), poly (lithium acrylate) (PLiAA), and LiClO4 were prepared in order to investigate the influence of LiClO4 content on the ionic conductivity of the electrolyte. All of the membranes were investigated by XRD, DSC, and EIS, et.al. The dependence of SPEs conductivity on temperature was measured, and the maximum ionic conductivity is 5.88×10-6 S/cm at 293 K for membrane which is composed of PEO+PLiAA+15wt% LiClO4. The electrochemical stability window of the PEO+PLiAA+15wt% LiClO4 is 4.75 V verse Li.